Well, you only got 30w of 6400k and thats nothing when you have 300w of 2700k.
In my case its 50/50, so if it really makes a huge difference ill go and get myself another highwatt cfl with warmwhite spectrum.
But numbers are the tasty part, assuming i get 50g of dried buds with my current dual spectrum setup, how much would i get if i go 2700k of the same wattage, assuming everything goes well....theoretically?